Blender crashes when rendering
When a render dies on Freestyle, it's usually a RAM issue. Freestyle takes a LOT of RAM (significantly more than Cycles for the same scene.) Once it runs out of your regular RAM, it will go into pagefile/virtual memory. This will slow your computer down to a crawl, because it's using your hard drive as memory. If it also runs out of pagefile space, it will crash. This is likely your issue.

The work around, if you were to attempt to still use freestyle, is to cut the scene down into more layers. Technically you can increase pagefile to give it more to work with, but even with a solid state drive this will be so slow as to be pointless.